There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

What does man love more than life, hate more than death or mortal strife; That which contented men desire; the poor have, the rich require; the miser spends, the spendthrift saves, and all men carry to their graves?

Open a Laptop which is password protected. Hint for the password is given as below:

1 mobile 3 books 2 Boards 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches

A boy was locked in a room by some robbers. All that is in the room is a piano, a calendar, and a bed. The room is locked from the outside. What does he eat, drink, and how does he escape and get out?

You see me once in June, twice in November, and not at all in May. What am I?

If,

A = 1

B = 2

C = 3

...

...

Z = 26.

Based on above rule, you need to find an eleven letter word whose letter sum is equal to 52.

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

Look at the picture and find out which square is not linked with any of the other squares.

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

A father's child, a mother's child, yet no one's son.

Who am I?